Transient grating spectroscopy of thermal diffusivity degradation in deuterium implanted tungsten

被引：15

作者：

Reza, Abdallah ^{[1
]}

Zayachuk, Yevhen ^{[2
]}

Yu, Hongbing ^{[1
]}

Hofmann, Felix ^{[1
]}

机构：

[1] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

[2] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

来源：

SCRIPTA MATERIALIA | 2020年 / 174卷

基金：

欧洲研究理事会;

关键词：

Deuterium plasma exposure; Thermal conductivity; Fusion armour materials; Transient grating spectroscopy; Surface acoustic wave speed; TEMPERATURE-DEPENDENCE; CONDUCTIVITY; IRRADIATION; RETENTION; PLASMA;

D O I：

10.1016/j.scriptamat.2019.08.014

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Using transient grating spectroscopy, we measure thermal diffusivity and surface acoustic wave speed in tungsten exposed to different fluences of deuterium plasma. Scanning electron microscopy (SEM) shows the formation of surface blisters that have similar morphology for all fluences considered. A significant reduction in thermal diffusivity and surface acoustic wave speed occurs as a result of plasma exposure. A saturation of the thermal diffusivity reduction with fluence is seen. Deuterium ion flux density appears to play a more important role in thermal diffusivity reduction than exposure time. These observations have important implications for plasma facing components in future fusion reactors. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：6 / 10

页数：5

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